Beckman Quarles Theorem: Geometry, Euclidean Space, Isometry

Hjelmslev's Theorem: Geometry, Euclidean Plane Isometry, Parallel Postulate

Jung's Theorem: Geometry, Inequality, Diameter, Euclidean Space

Varignon's Theorem: Euclidean Geometry, Quadrilateral

Affine space: Mathematics, geometry, Euclidean space, Linear subspace, combination, independence, Line ......